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<div class="title">inflate.h</div>  </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/* inflate.h -- internal inflate state definition</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright (C) 1995-2004 Mark Adler</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * For conditions of distribution and use, see copyright notice in zlib.h</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160; </div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">/* WARNING: this file should *not* be used by applications. It is</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">   part of the implementation of the compression library and is</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">   subject to change. Applications should only use zlib.h.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160; </div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment">/* define NO_GZIP when compiling if you want to disable gzip header and</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment">   trailer decoding by inflate().  NO_GZIP would be used to avoid linking in</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment">   the crc code when it is not needed.  For shared libraries, gzip decoding</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment">   should be left enabled. */</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#ifndef NO_GZIP</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#  define GUNZIP</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160; </div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment">/* Possible inflate modes between inflate() calls */</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="keyword">typedef</span> <span class="keyword">enum</span> {</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;    HEAD,       <span class="comment">/* i: waiting for magic header */</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;    FLAGS,      <span class="comment">/* i: waiting for method and flags (gzip) */</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;    TIME,       <span class="comment">/* i: waiting for modification time (gzip) */</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;    OS,         <span class="comment">/* i: waiting for extra flags and operating system (gzip) */</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;    EXLEN,      <span class="comment">/* i: waiting for extra length (gzip) */</span></div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;    EXTRA,      <span class="comment">/* i: waiting for extra bytes (gzip) */</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;    NAME,       <span class="comment">/* i: waiting for end of file name (gzip) */</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;    COMMENT,    <span class="comment">/* i: waiting for end of comment (gzip) */</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;    HCRC,       <span class="comment">/* i: waiting for header crc (gzip) */</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;    DICTID,     <span class="comment">/* i: waiting for dictionary check value */</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    DICT,       <span class="comment">/* waiting for inflateSetDictionary() call */</span></div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;        TYPE,       <span class="comment">/* i: waiting for type bits, including last-flag bit */</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;        TYPEDO,     <span class="comment">/* i: same, but skip check to exit inflate on new block */</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;        STORED,     <span class="comment">/* i: waiting for stored size (length and complement) */</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;        COPY,       <span class="comment">/* i/o: waiting for input or output to copy stored block */</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;        TABLE,      <span class="comment">/* i: waiting for dynamic block table lengths */</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;        LENLENS,    <span class="comment">/* i: waiting for code length code lengths */</span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;        CODELENS,   <span class="comment">/* i: waiting for length/lit and distance code lengths */</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;            LEN,        <span class="comment">/* i: waiting for length/lit code */</span></div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;            LENEXT,     <span class="comment">/* i: waiting for length extra bits */</span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;            DIST,       <span class="comment">/* i: waiting for distance code */</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;            DISTEXT,    <span class="comment">/* i: waiting for distance extra bits */</span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;            MATCH,      <span class="comment">/* o: waiting for output space to copy string */</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;            LIT,        <span class="comment">/* o: waiting for output space to write literal */</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    CHECK,      <span class="comment">/* i: waiting for 32-bit check value */</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    LENGTH,     <span class="comment">/* i: waiting for 32-bit length (gzip) */</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    DONE,       <span class="comment">/* finished check, done -- remain here until reset */</span></div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    BAD,        <span class="comment">/* got a data error -- remain here until reset */</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    MEM,        <span class="comment">/* got an inflate() memory error -- remain here until reset */</span></div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;    SYNC        <span class="comment">/* looking for synchronization bytes to restart inflate() */</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;} inflate_mode;</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160; </div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment">    State transitions between above modes -</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="comment">    (most modes can go to the BAD or MEM mode -- not shown for clarity)</span></div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="comment">    Process header:</span></div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="comment">        HEAD -&gt; (gzip) or (zlib)</span></div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="comment">        (gzip) -&gt; FLAGS -&gt; TIME -&gt; OS -&gt; EXLEN -&gt; EXTRA -&gt; NAME</span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment">        NAME -&gt; COMMENT -&gt; HCRC -&gt; TYPE</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment">        (zlib) -&gt; DICTID or TYPE</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment">        DICTID -&gt; DICT -&gt; TYPE</span></div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment">    Read deflate blocks:</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">            TYPE -&gt; STORED or TABLE or LEN or CHECK</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment">            STORED -&gt; COPY -&gt; TYPE</span></div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="comment">            TABLE -&gt; LENLENS -&gt; CODELENS -&gt; LEN</span></div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="comment">    Read deflate codes:</span></div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="comment">                LEN -&gt; LENEXT or LIT or TYPE</span></div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="comment">                LENEXT -&gt; DIST -&gt; DISTEXT -&gt; MATCH -&gt; LEN</span></div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="comment">                LIT -&gt; LEN</span></div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="comment">    Process trailer:</span></div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="comment">        CHECK -&gt; LENGTH -&gt; DONE</span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160; </div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="comment">/* state maintained between inflate() calls.  Approximately 7K bytes. */</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"><a class="line" href="structinflate__state.html">   77</a></span>&#160;<span class="keyword">struct </span><a class="code" href="structinflate__state.html">inflate_state</a> {</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;    inflate_mode mode;          <span class="comment">/* current inflate mode */</span></div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    <span class="keywordtype">int</span> last;                   <span class="comment">/* true if processing last block */</span></div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    <span class="keywordtype">int</span> wrap;                   <span class="comment">/* bit 0 true for zlib, bit 1 true for gzip */</span></div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;    <span class="keywordtype">int</span> havedict;               <span class="comment">/* true if dictionary provided */</span></div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    <span class="keywordtype">int</span> flags;                  <span class="comment">/* gzip header method and flags (0 if zlib) */</span></div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    <span class="keywordtype">unsigned</span> dmax;              <span class="comment">/* zlib header max distance (INFLATE_STRICT) */</span></div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> check;        <span class="comment">/* protected copy of check value */</span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> total;        <span class="comment">/* protected copy of output count */</span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    gz_headerp head;            <span class="comment">/* where to save gzip header information */</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;        <span class="comment">/* sliding window */</span></div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    <span class="keywordtype">unsigned</span> wbits;             <span class="comment">/* log base 2 of requested window size */</span></div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    <span class="keywordtype">unsigned</span> wsize;             <span class="comment">/* window size or zero if not using window */</span></div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    <span class="keywordtype">unsigned</span> whave;             <span class="comment">/* valid bytes in the window */</span></div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    <span class="keywordtype">unsigned</span> write;             <span class="comment">/* window write index */</span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> FAR *window;  <span class="comment">/* allocated sliding window, if needed */</span></div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;        <span class="comment">/* bit accumulator */</span></div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> hold;         <span class="comment">/* input bit accumulator */</span></div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    <span class="keywordtype">unsigned</span> bits;              <span class="comment">/* number of bits in &quot;in&quot; */</span></div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;        <span class="comment">/* for string and stored block copying */</span></div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;    <span class="keywordtype">unsigned</span> length;            <span class="comment">/* literal or length of data to copy */</span></div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;    <span class="keywordtype">unsigned</span> offset;            <span class="comment">/* distance back to copy string from */</span></div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;        <span class="comment">/* for table and code decoding */</span></div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;    <span class="keywordtype">unsigned</span> extra;             <span class="comment">/* extra bits needed */</span></div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;        <span class="comment">/* fixed and dynamic code tables */</span></div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;    <a class="code" href="structcode.html">code</a> <span class="keyword">const</span> FAR *lencode;    <span class="comment">/* starting table for length/literal codes */</span></div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;    <a class="code" href="structcode.html">code</a> <span class="keyword">const</span> FAR *distcode;   <span class="comment">/* starting table for distance codes */</span></div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    <span class="keywordtype">unsigned</span> lenbits;           <span class="comment">/* index bits for lencode */</span></div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;    <span class="keywordtype">unsigned</span> distbits;          <span class="comment">/* index bits for distcode */</span></div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;        <span class="comment">/* dynamic table building */</span></div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;    <span class="keywordtype">unsigned</span> ncode;             <span class="comment">/* number of code length code lengths */</span></div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    <span class="keywordtype">unsigned</span> nlen;              <span class="comment">/* number of length code lengths */</span></div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    <span class="keywordtype">unsigned</span> ndist;             <span class="comment">/* number of distance code lengths */</span></div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;    <span class="keywordtype">unsigned</span> have;              <span class="comment">/* number of code lengths in lens[] */</span></div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;    <a class="code" href="structcode.html">code</a> FAR *next;             <span class="comment">/* next available space in codes[] */</span></div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> lens[320];   <span class="comment">/* temporary storage for code lengths */</span></div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;    <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> work[288];   <span class="comment">/* work area for code table building */</span></div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;    <a class="code" href="structcode.html">code</a> codes[ENOUGH];         <span class="comment">/* space for code tables */</span></div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;};</div>
<div class="ttc" id="astructcode_html"><div class="ttname"><a href="structcode.html">code</a></div><div class="ttdef"><b>Definition:</b> inftrees.h:24</div></div>
<div class="ttc" id="astructinflate__state_html"><div class="ttname"><a href="structinflate__state.html">inflate_state</a></div><div class="ttdef"><b>Definition:</b> inflate.h:77</div></div>
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